JP2009227300A - Pouch with straw cap for hydrogen-containing beverage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the shell life of hydrogen, to improve welding between a flexible packaging sheet and a straw and to maintain strength of the straw and the cap as to a pouch with a straw cap for a hydrogen-containing beverage. <P>SOLUTION: In forming this pouch, a synthetic resin-molded straw 2 is welded to a bag-shaped container 1 made of a flexible packaging sheet and the outside end of the straw is closed by tightening a synthetic resin-molded cap 3. An enclosed item in the pouch is a hydrogen-containing beverage h and the straw molding resin is a resin where ethylene vinyl alcohol copolymer and polyethylene are mixed. The cap molding resin is a resin where ethylene vinyl alcohol copolymer and polyethylene or polypropylene are mixed. The flexible packaging sheets 11 and 12 are composite sheets whose layer to which the straw is welded is a polyethylene film. Polyethylene for the straw welding layer of the flexible packaging sheet and that in the straw molding resin is replaced with polypropylene. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a straw cap pouch for enclosing a beverage containing hydrogen.

  Hydrogen water containing hydrogen has a high reducing power and is drunk as good for health. As with other health drinks, this hydrogen water drink is sold in a bag-like container made of a soft packaging sheet called a pouch.

  The pouch is welded through a straw in a bag-like container made of a soft packaging sheet, the inner end of the straw is opened in the bag-like container and immersed in the hydrogen water of the enclosed material, and the outer end of the straw is placed in the bag-like container It protrudes by opening to the outside, and a cap is screwed onto the outer end of the straw. When storing hydrogen water, the outer end of the straw is tightly closed by tightening a cap on the outer end of the straw. When drinking hydrogen water, remove the cap, open the outer end of the straw, and place the outer end of the straw in the mouth.

Japanese Patent Laid-Open No. 10-129782

[Issues of background technology]
When the hydrogen water as described above is sealed and stored in a pouch with a straw cap as described above, the hydrogen content decreases and the reducing power decreases. Hydrogen water is less valuable as a health drink. Straw-capped pouches do not have high hydrogen storage.

[Cause of issue]
In the pouch with a straw cap, the soft packaging sheet of the bag-like container is a composite sheet. This sheet is formed by laminating various films or foils such as a metal foil or resin film having a high gas barrier property, a resin film having a high weldability, or a resin film having a high strength. The bag-like container of the flexible packaging sheet takes measures against gas permeation.

  The straw and cap are molded products of synthetic resin. Polyethylene or polypropylene is used for the synthetic resin. The straw and cap are thicker than the thin flexible packaging sheet, and each part is thick. Therefore, no special measures are taken for gas permeation. Materials polyethylene and polypropylene have low gas barrier properties.

  Therefore, the reason why the hydrogen content of the hydrogen water decreases in the pouch with a straw cap is presumably because hydrogen leaks through the straw and the cap.

[Research and experiment of problem solving]
In a pouch with a straw cap, if hydrogen leaks mainly through the straw and cap of a synthetic resin molded product, the material of the straw and cap may be replaced with a resin that has high hydrogen storage or blocking properties. It is done. Various resins with high gas barrier properties such as oxygen and carbon dioxide are known. Resins with a high hydrogen barrier are not as well known as resins with a high oxygen barrier. Hydrogen H ₂ is different from oxygen O ₂ and carbon dioxide CO _{2 in} physical properties such as low molecular weight.

  The straw is welded to the soft packaging sheet of the bag-like container. Therefore, a resin having high weldability with a soft packaging sheet is required. Furthermore, the straw is closed by tightening the cap. For this reason, the straw and the cap are required to have a strong resin that can withstand the tightening.

That is, the resin of the straw material is required to have hydrogen storage property, barrier property, weldability and strength. The resin of the cap material is required to have hydrogen storage property or barrier property and strength.
However, no resin satisfying these requirements was found in a single resin.

  Therefore, an ethylene vinyl alcohol copolymer and polyethylene (PE) were selected. An ethylene vinyl alcohol copolymer film is known as a film having a high oxygen barrier property. The ethylene vinyl alcohol copolymer is obtained by saponifying ethylene vinyl acetate copolymer (EVA). Polyethylene is known as a resin having high weldability and high strength.

  A straw-cap pouch was made using ethylene vinyl alcohol copolymer and polyethylene. The resin for molding the straw and cap was a resin in which ethylene vinyl alcohol copolymer and polyethylene were mixed. In this mixed resin, the ethylene vinyl alcohol copolymer and polyethylene were made approximately the same weight. The soft packaging sheet of the bag-like container was a composite sheet in which the layer to be welded to the straw was a polyethylene film. The pouch with a straw cap of this prototype had good welding between the soft packaging sheet of the bag-like container and the straw, and the strength of the straw and cap was not insufficient.

  In addition, when the weight ratio of the polyethylene in the molding resin was less than about 10%, the straw became insufficient in welding and strength. The cap became insufficient in strength when the weight percentage of polyethylene in the molding resin was less than about 10%.

  A comparative example was produced in which the molding resin of the straw and cap in the prototype was a single resin of polyethylene. The pouches with straw caps of the prototype and the comparative example were each filled with hydrogen water and left under normal temperature and pressure. In the prototype and the comparative example, the hydrogen water had a hydrogen content of 0.6 to 0.8 ppm and a redox potential of −500 to −550 mV at the time of filling. At the elapse of 3 months, in the comparative example, the hydrogen content was 0.1 to 0.3 ppm and the oxidation-reduction potential was reduced to -150 to -200 mV. In the prototype, it was hardly lowered, the hydrogen content was 0.6 to 0.8 ppm, and the oxidation-reduction potential was −500 to −550 mV. The prototype pouch with a straw cap has a higher hydrogen storage stability than that of the comparative example.

  In addition, when the weight ratio of the ethylene vinyl alcohol copolymer in the molding resin was less than 40%, the straw and the cap had insufficient hydrogen storage properties.

  Further, in the above prototype and comparative examples, polyethylene was replaced with polypropylene (PP), and the same experiment was performed. Even with a straw-capped pouch using polypropylene and ethylene vinyl alcohol copolymer, the hydrogen content and redox potential were hardly reduced, as in the above prototype using polyethylene and ethylene vinyl alcohol copolymer. . Hydrogen storage is higher than that of the comparative example. Moreover, the soft packaging sheet of the bag-like container and the straw were well welded, and the strength of the straw and cap was not insufficient.

1) A synthetic resin molded product through a straw is welded to a bag-like container made of a soft packaging sheet, the inner end of the straw is opened inside the bag-like container, and the outer end of the straw is opened outside the bag-like container, In the pouch with a straw cap that closes the outer end of the straw by tightening the cap of the synthetic resin molded product on the outer end of the straw,
The inclusion should be a hydrogen-containing beverage
The resin for molding the straw is a resin mixed with ethylene vinyl alcohol copolymer and polyethylene, and the resin for molding the cap is a resin mixed with ethylene vinyl alcohol copolymer and polyethylene or polypropylene,
A pouch with a straw cap for a hydrogen-containing beverage, wherein the soft packaging sheet of the bag-like container is a composite sheet in which a layer to be welded to the straw is a polyethylene film.
2) In the above pouch with a straw cap for a hydrogen-containing beverage,
The polyethylene in the molding resin of the straw and the polyethylene in the straw welding layer of the soft packaging sheet are replaced with polypropylene.
3) In the above-mentioned pouch with a straw cap for a hydrogen-containing beverage,
The molding resin for the straw and cap is characterized in that the weight ratio of the ethylene vinyl alcohol copolymer is about 40 to 90%.

  A pouch with a straw cap for a hydrogen-containing beverage has high hydrogen storage stability. Hydrogen-containing beverages are unlikely to have a reduced hydrogen content during storage. The soft packaging sheet of the bag-like container and the straw are well welded, and the strength of the straw and cap is not insufficient.

[First example]
The pouch with a straw cap for a hydrogen-containing beverage of this example is a standing pouch as shown in FIGS. This pouch has a straw 2 attached to a bag-like container 1 and a cap 3 attached to the straw 2. The bag-like container 1 penetrates the straw 2 in the vertical direction on the upper side. The straw 2 has a lower end opened in the bag-like container 1 and an upper end opened outside the bag-like container 1. The upper end of the straw 2 is tightened with a cap 3 to close the opening. The bag-like container 1 is filled with hydrogen water h. The hydrogen water h is obtained by dissolving hydrogen gas in natural water.

  The bag-like container 1 is formed by welding a front side flexible packaging sheet 11, a rear side flexible packaging sheet 12 and a lower side flexible packaging sheet 13 at their side portions to form a vertically long bag made of a flexible packaging sheet. Yes. The front flexible packaging sheet 11 and the rear flexible packaging sheet 12 sandwich a straw 2 of a synthetic resin molded product between upper side portions. The upper side portions of the front and rear flexible packaging sheets 11 and 12 and the welding portion 14 at the center of the straw 2 are welded by hot pressing.

  The lower end or inner end 15 of the straw 2 protrudes into the bag-like container 1 and is immersed in the hydrogen water h contained in the bag-like container 1. The upper end or the outer end 16 of the cylindrical straw 2 protrudes outside the bag-like container 1 and forms an external thread on the outer peripheral surface. The cap 3 forms a peripheral wall below the circular top plate, and forms an internal thread on the inner peripheral surface of the peripheral wall. The cap 3 of the synthetic resin molded product is screwed onto the outer end 16 of the straw 2. When storing the hydrogen water, the cap 3 is fastened to the outer end of the straw 2 to close the outer end of the straw 2 tightly. When drinking hydrogen water, the cap 3 is removed, the outer end 16 of the straw 2 is opened, and the outer end 16 of the straw 2 is added to the mouth.

  The flexible wrapping sheets 11, 12, and 13 are made into a four-layer composite sheet. As shown in FIG. 4, this composite sheet is formed by laminating a polyethylene terephthalate (PET) film 21, an aluminum foil 22, a polyamide film 23 and a polyethylene (PE) film 24. The polyethylene terephthalate film 21 constitutes the outer layer of the composite sheet. The aluminum foil 22 and the polyamide film 23 constitute an intermediate layer of the composite sheet. The polyethylene film 24 constitutes an inner layer and a welding layer of the composite sheet. The polyethylene terephthalate film 21 has good appearance and good scent retention. The aluminum foil 22 has a high gas barrier property and is attached to the inner surface of the polyethylene terephthalate film 21. The polyamide film 23 has a high gas barrier property and is attached to the inner surface of the aluminum foil 22. The polyethylene film 24 has high weldability and strength, and is attached to the inner surface of the polyamide film 23. The composite sheets 21 to 24 have a hydrogen blocking property or storage property. The side portions of the flexible packaging sheets 11 to 13 weld the polyethylene films 24 of the inner layers of the composite sheets 21 to 24 to each other.

  The molding resin for the straw 2 and the cap 3 is a resin in which an ethylene vinyl alcohol copolymer and polyethylene (PE) are mixed. In the mixed resin, the ethylene vinyl alcohol copolymer and the polyethylene are made approximately the same weight.

  In the composite sheets 21 to 24 of the front and rear flexible packaging sheets 11 and 12, the polyethylene film 24 of the inner layer is welded to the welding portion 14 of the straw 2. The straw 2 contains polyethylene in the molding resin, and is well welded to the polyethylene film 24 of the inner layer of the composite sheet.

  The straw 2 and the cap 3 contain polyethylene in the molding resin, and have strength to withstand tightening. The outer end of the straw 2 can be closed tightly. Moreover, the straw 2 and the cap 3 contain an ethylene vinyl alcohol copolymer in the molding resin, and have a high hydrogen barrier property or storage stability.

  In the pouch with a straw cap for a hydrogen-containing beverage of this example, even if the hydrogen water h is stored for a long period of time, the hydrogen content is unlikely to decrease.

[Second example]
In the pouch with a straw cap for a hydrogen-containing beverage of this example, the polyethylene in the first example is replaced with polypropylene (PP). Polypropylene is a resin with high weldability, strength, and heat resistance.

  The molding resin for the straw 2 and the cap 3 is a resin in which an ethylene vinyl alcohol copolymer and polypropylene are mixed. The straw 2 and the cap 3 contain polypropylene in the molding resin, and have strength to withstand tightening. Moreover, the straw 2 and the cap 3 contain an ethylene vinyl alcohol copolymer in the molding resin, and have a high hydrogen barrier property or storage stability.

The inner layer 24 and the welding layer of the composite sheets 21 to 24 of the flexible packaging sheets 11 to 13 are made of a polypropylene film. The straw 2 contains polypropylene in the molding resin, and is well welded to the polypropylene film 24 of the composite sheet inner layer.
Other points are the same as in the first example.

[Modification]
1) In the above embodiment, the mechanism for tightly closing the straw 2 and the cap 3 and the mechanism for tightly closing the outer end 16 of the straw 2 is a screw mechanism, but is a fitting mechanism.
2) In the above embodiment, the inner end 15 of the straw 2 protrudes into the bag-like container 1 but does not protrude into the bag-like container 1.
3) In said embodiment, although the straw 2 is arrange | positioned in the up-down direction and the longitudinal direction of the bag-shaped container 1, it inclines to the left side or the right side from an up-down direction.
4) In the above embodiment, the bag-like container 1 is a standing pouch, but is a gusset pouch or a flat pouch.
5) In said embodiment, although the composite sheets 21-24 of the flexible packaging sheets 11-13 are 4 layers, they are made into 2 layers, 3 layers, or 5 layers.

The front view of the pouch with a straw cap for hydrogen content drinks in the embodiment of the present invention. AA sectional view taken on the line AA of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 1. The enlarged view of the welding part of the soft packaging sheet and straw in sectional drawing of FIG.

Explanation of symbols

h Hydrogen water, inclusion in a bag-like container 1 Bag-like container made of a soft packaging sheet 2 Synthetic resin molded product straw 3 Synthetic resin molded product cap 11-13 Soft packaging sheet 11 Front flexible packaging sheet 12 Rear flexible Wrapping sheet 13 Lower soft packing sheet 14 Center part of straw, welding part 15 Lower end of straw, inner end 16 Upper end of straw, outer ends 21-24 Composite sheet 21 Polyethylene terephthalate film, outer layer 22 of composite sheet Aluminum foil, composite Sheet intermediate layer 23 Polyamide film, composite sheet intermediate layer 24 Polyethylene film, composite sheet inner layer, straw welded layer, polypropylene film

Claims (3)

A synthetic resin molded product straw is passed through and welded to a bag-shaped container made of flexible packaging sheet, the inner end of the straw is opened inside the bag-shaped container, the outer end of the straw is opened outside the bag-shaped container, and the straw In a pouch with a straw cap that tightens a cap of a synthetic resin molded product on the outer end and closes the outer end of the straw,
The inclusion should be a hydrogen-containing beverage
The resin for molding the straw is a resin mixed with ethylene vinyl alcohol copolymer and polyethylene, and the resin for molding the cap is a resin mixed with ethylene vinyl alcohol copolymer and polyethylene or polypropylene,
A pouch with a straw cap for a hydrogen-containing beverage, wherein the soft packaging sheet of the bag-like container is a composite sheet in which a layer to be welded to the straw is a polyethylene film. A synthetic resin molded product straw is passed through and welded to a bag-shaped container made of flexible packaging sheet, the inner end of the straw is opened inside the bag-shaped container, the outer end of the straw is opened outside the bag-shaped container, and the straw In a pouch with a straw cap that closes the outer end of the straw by tightening the cap of the synthetic resin molded product on the outer end,
The inclusion should be a hydrogen-containing beverage
The resin for molding the straw is a resin mixed with ethylene vinyl alcohol copolymer and polypropylene, and the resin for molding the cap is a resin mixed with ethylene vinyl alcohol copolymer and polypropylene or polyethylene,
A pouch with a straw cap for a hydrogen-containing beverage, characterized in that the soft packaging sheet of the bag-like container is a composite sheet in which a layer welded to the straw is a polypropylene film.   3. The pouch with a straw cap for a hydrogen-containing beverage according to claim 1 or 2, wherein the molding resin of the straw and the cap has a weight ratio of ethylene vinyl alcohol copolymer of about 40 to 90%.

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